// B2029 write by cn_ryh
#include <cstdio>
using namespace std;
int main()
{
    int h, r;
    scanf("%d %d", &h, &r);
    double v = h * 3.1415926 * r * r / 1000.0;
    double now = 0;
    int res = 0;
    while (now < 20.0)
    {
        now += v;
        res++;
    }
    printf("%d", res);
}
